7
6
9
2
3
2
7
1
8
8
2
3
7
2
9
4
5
6
8
4
1
2
6
6
4
1
1
5
8
Time 00:00
Mistakes 0
Ready
Expert Sudoku #181
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 29 of 81 |
| Technique score | 24.8 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 5 already sees all eight other digits in its row, column and box, so it can only be 1.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.